Packaging changes in lirc 0.9.2

For consistency with upstream naming, the lirc-utils package was renamed to lirc. The wpc8769l kernel drivers were dropped and can be obtained by installing lirc-wpc8769l from the AUR.

Note that 0.9.2 is a major release and comes along with several upstream and packaging changes. In particular, the irexec.service systemd unit was removed. Please edit and copy the template /usr/share/lirc/contrib/irexec.service if you want to keep using that service.